feat: add ColumnDef expression parser (#6075)

Author: geooo109

sqlglot/parser.py

@@ -805,6 +805,7 @@ class Parser(metaclass=_Parser):
     EXPRESSION_PARSERS = {
         exp.Cluster: lambda self: self._parse_sort(exp.Cluster, TokenType.CLUSTER_BY),
         exp.Column: lambda self: self._parse_column(),
+        exp.ColumnDef: lambda self: self._parse_column_def(self._parse_column()),
         exp.Condition: lambda self: self._parse_assignment(),
         exp.DataType: lambda self: self._parse_types(allow_identifiers=False, schema=True),
         exp.Expression: lambda self: self._parse_expression(),

tests/test_parser.py

@@ -40,6 +40,8 @@ def test_parse_into(self):
             "Failed to parse 'SELECT * FROM tbl' into <class 'sqlglot.expressions.Table'>",
         )
 
+        self.assertIsInstance(parse_one("foo INT NOT NULL", into=exp.ColumnDef), exp.ColumnDef)
+
     def test_parse_into_error(self):
         expected_message = "Failed to parse 'SELECT 1;' into [<class 'sqlglot.expressions.From'>]"
         expected_errors = [